Properly working switches and body note

Switches have changed to 'loznotes=' format and will work properly with
other substrings (such as Codekit cachebuster).

Also added ability to place a note on the body element, that can be
used to describe the page.
Added example body note
BEM-ish CSS and body note style

Changed classes to be more BEM-ish, with loznote/loznotes prefixes.
Added styles for body note text.
Updated read me to reflect bodynote and switch changes